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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2021/11/19 03:29:03 UTC
[GitHub] [servicecomb-java-chassis] five111 opened a new issue #2642: spi加载类失败，报空指针
five111 opened a new issue #2642:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2642
### 异常堆栈如下
```
[2021-11-19 01:10:38,139]-[00e0be6c7e2e836d]-[1002]-[group0-1-thread-23]-[org.apache.servicecomb.registry.consumer.MicroserviceVersions.safeSetInstances(MicroserviceVersions.java:201)]-[ERROR] Failed to setInstances, appId=adc, microserviceName=adc:adc-log.
java.lang.NullPointerException:
at org.apache.servicecomb.registry.consumer.MicroserviceVersions.lambda$mergeInstances$3(MicroserviceVersions.java:252) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1384) ~[?:1.8.0_302]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647) ~[?:1.8.0_302]
at org.apache.servicecomb.registry.consumer.MicroserviceVersions.mergeInstances(MicroserviceVersions.java:251) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.consumer.MicroserviceVersions.setInstances(MicroserviceVersions.java:225) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.consumer.MicroserviceVersions.safeSetInstances(MicroserviceVersions.java:198) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.consumer.MicroserviceVersions.pullInstances(MicroserviceVersions.java:178) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.consumer.MicroserviceManager.getOrCreateMicroserviceVersions(MicroserviceManager.java:64) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.consumer.AppManager.getOrCreateMicroserviceVersions(AppManager.java:66) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.registry.DiscoveryManager.getOrCreateMicroserviceVersions(DiscoveryManager.java:133) ~[foundation-registry-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.SCBEngine.createMicroserviceReferenceConfig(SCBEngine.java:540) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.SCBEngine.createMicroserviceReferenceConfig(SCBEngine.java:511) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest.createRequestMeta(CseClientHttpRequest.java:184) ~[provider-springmvc-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.provider.springmvc.reference.CseClientHttpRequest.execute(CseClientHttpRequest.java:169) ~[provider-springmvc-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:776) ~[spring-web-5.3.12.jar:5.3.12]
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:660) ~[spring-web-5.3.12.jar:5.3.12]
at org.apache.servicecomb.provider.springmvc.reference.RestTemplateWrapper.exchange(RestTemplateWrapper.java:202) ~[provider-springmvc-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at com.huawei.mateinfo.sdk.log.operation.service.impl.ShardOperationLogRecorder.record(ShardOperationLogRecorder.java:44) ~[mateinfo-sdk-ext-log-2.2.RC1.B012.v7.jar:?]
at com.huawei.mateinfo.sdk.log.operation.service.impl.OperationLoggerImpl.log(OperationLoggerImpl.java:75) ~[mateinfo-sdk-ext-log-2.2.RC1.B012.v7.jar:?]
at sun.reflect.GeneratedMethodAccessor1034.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_302]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_302]
at com.huawei.mateinfo.sdk.log.operation.handler.OperationLogInvocationHandler.invoke(OperationLogInvocationHandler.java:40) ~[mateinfo-sdk-ext-log-2.2.RC1.B012.v7.jar:?]
at com.sun.proxy.$Proxy423.log(Unknown Source) ~[?:?]
at com.huawei.mateinfo.sdk.log.operation.aspect.OperationLogAspect.logByOperationSource(OperationLogAspect.java:170) ~[mateinfo-sdk-ext-log-2.2.RC1.B012.v7.jar:?]
at com.huawei.mateinfo.sdk.log.operation.aspect.OperationLogAspect.doAfterReturning(OperationLogAspect.java:58) ~[mateinfo-sdk-ext-log-2.2.RC1.B012.v7.jar:?]
at sun.reflect.GeneratedMethodAccessor1330.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_302]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_302]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:617) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.aspectj.AspectJAfterReturningAdvice.afterReturning(AspectJAfterReturningAdvice.java:66) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:58) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:753) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:753) ~[spring-aop-5.3.12.jar:5.3.12]
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:698) ~[spring-aop-5.3.12.jar:5.3.12]
at com.huawei.mateinfo.bpmservice.definition.process.api.inner.ProcessInstallRpcServiceImpl$$EnhancerBySpringCGLIB$$8d5be1d2.prepare(<generated>) ~[mateinfo-bpmservice-definition-2.2.112.1.jar:?]
at sun.reflect.GeneratedMethodAccessor1349.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_302]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_302]
at org.apache.servicecomb.core.handler.impl.ProducerOperationHandler.doInvoke(ProducerOperationHandler.java:128) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.handler.impl.ProducerOperationHandler.syncInvoke(ProducerOperationHandler.java:113) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.handler.impl.ProducerOperationHandler.invoke(ProducerOperationHandler.java:61) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.handler.impl.ProducerOperationHandler.handle(ProducerOperationHandler.java:52) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.Invocation.next(Invocation.java:307) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.tracing.zipkin.ZipkinTracingHandler.handle(ZipkinTracingHandler.java:52) ~[handler-tracing-zipkin-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.tracing.zipkin.ZipkinProviderTracingHandler.handle(ZipkinProviderTracingHandler.java:24) ~[handler-tracing-zipkin-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.core.Invocation.next(Invocation.java:307) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at com.huawei.mateinfo.sdk.service.handler.ProviderMetricsHandler.handle(ProviderMetricsHandler.java:41) ~[mateinfo-sdk-base-service-2.2.RC1.B012.v7.jar:?]
at org.apache.servicecomb.core.Invocation.next(Invocation.java:307) ~[java-chassis-core-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.common.rest.AbstractRestInvocation.doInvoke(AbstractRestInvocation.java:245) ~[common-rest-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.common.rest.AbstractRestInvocation.invoke(AbstractRestInvocation.java:219) ~[common-rest-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.common.rest.AbstractRestInvocation.runOnExecutor(AbstractRestInvocation.java:203) ~[common-rest-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at org.apache.servicecomb.common.rest.AbstractRestInvocation.lambda$scheduleInvocation$0(AbstractRestInvocation.java:162) ~[common-rest-2.1.5-h0.gts.dsp.r39.jar:2.1.5-h0.gts.dsp.r39]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_302]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_302]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_302]
```
### 经排查 org.apache.servicecomb.registry.consumer.MicroserviceVersions 出现空指针的位置如下
这里的ping为空 看了下这个MicroserviceInstancePing.class只有默认实现SimpleMicroserviceInstancePing
这个大概是什么原因导致的，因为发现重启就会ok，所以无法继续debug
```
private MergedInstances mergeInstances(List<MicroserviceInstance> pulledInstances,
Collection<MicroserviceInstance> inUseInstances) {
MergedInstances mergedInstances = new MergedInstances();
MicroserviceInstancePing ping = SPIServiceUtils.getPriorityHighestService(MicroserviceInstancePing.class);
pulledInstances.stream().forEach(instance -> {
if (ping.ping(instance)){
mergedInstances.addInstance(instance);
}
});
if (pulledInstances.isEmpty() && inUseInstances != null && ServiceRegistryCommonConfig
.isEmptyInstanceProtectionEnabled()) {
inUseInstances.stream().forEach(instance -> {
if (!mergedInstances.instanceIdMap.containsKey(instance.getInstanceId())) {
if (ping.ping(instance)) {
mergedInstances.addInstance(instance);
}
}
});
}
```
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[GitHub] [servicecomb-java-chassis] SpireCat commented on issue #2642: spi加载类失败，报空指针
Posted by GitBox <gi...@apache.org>.
SpireCat commented on issue #2642:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2642#issuecomment-976332519
刚解决完这个问题，确认下是不是在CompletableFuture的线程内发起的调用。
详细原理可以参考：https://cloud.tencent.com/developer/article/1765767
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[GitHub] [servicecomb-java-chassis] fanjiwang1992 commented on issue #2642: spi加载类失败，报空指针
Posted by GitBox <gi...@apache.org>.
fanjiwang1992 commented on issue #2642:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2642#issuecomment-976373817
https://github.com/apache/servicecomb-java-chassis/issues/1221
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[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #2642: spi加载类失败，报空指针
Posted by GitBox <gi...@apache.org>.
liubao68 commented on issue #2642:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2642#issuecomment-976481765
"用户要改类加载器，不让他改?" 或者 "假设SPI一定在某个类加载器加载，始终使用这个加载器?"
感觉两个处理措施都不合理。
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[GitHub] [servicecomb-java-chassis] five111 commented on issue #2642: spi加载类失败，报空指针
Posted by GitBox <gi...@apache.org>.
five111 commented on issue #2642:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2642#issuecomment-976388166
考虑一下 可否避免用户因为自己的操作 导致类加载器变更？
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